Gordon broke down with an apparent hip injury towards the end of last night's World Cup qualifying win against Albania.
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Afterwards, Tuchel said: "He looks injured.
"First of all I thought it was his stomach but it's his hip and it does not look good."
Gordon was a second-half substitute during the 2-0 win, but suffered the setback before the final whistle. A scan is due this morning to assess the damage.